A Spanish magazine has poured oil on the fire by publishing a topless image of François Hollande's alleged mistress Julie Gayet, on its front cover. The move will likely infuriate the actress who is already suing Closer magazine over its report of their alleged affair.

A topless image of François Hollande’s alleged mistress Julie Gayet was plastered on the front cover of a Spanish magazine this weekend.

The celebrity gossip magazine Interviu published the photograph of 41-year-old Gayet in its weekend edition.

Hollande's alleged fling with Gayet continues to make headlines in France and abroad with the president forced to answer a question on a trip to the Netherlands on Monday over the health of his partner Valérie Trierweiler, who spent a week in hospital after news of the revelations broke.

A journalist asked how Trierweiler was during a joint press conference with Dutch Prime Minister Mark Rutte in The Hague, where Hollande is on his first trip abroad since news of the affair broke.

"I thank you for your question," Hollande said.

"Valérie Trierweiler is doing better and resting at the moment at La Lanterne," he said, referring to the presidential residence in Versailles, outside Paris.